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SECTION 4

TROUBLESHOOTING GUIDE FOR 71171 MT2 PRINTER/CHARGER

Does not power up
Fuse blown

Does not power up
Fuse not blown

Note: with any board
that does not power
up, check fuses first.

Does not feed

Defective print

Does not receive data

Power light does not
light

Charge light does
not light

Charge light ON
without handle in well

Shorted Q1

Replace Q1

Shorted D1

Replace D1

Defective C3

Replace C3

Defective C4

Replace C4

Defective U1- Voltage at U1,

Replace U1

pins ll - 12 is too low (under
13VOC) or too high
(over 17VDC)

Defective D6 (shorted)

Replace D6

Print Head Shorted

Replace Print Head

Poor cable connection (P302)

Reseat cable

Defective U201

Replace U201

Defective Print Head

Replace Print Head

Defective U201 (portions of

Replace U201

print missing)

Poor cable connection (P301)

Reset cable

Cold solder joint on contact

Repair cold solder joint

housing assembly (711702-501)

Defective - contact housing

Replace contact housing

assembly

Cold solder joint at P302

Repair cold solder joint

U301 defective

Replace U301

LED defective

Replace LED

Cold solder joint at P302

Repair cold solder joint

Q305 defective

Replace Q305

LED defective

Replace LED

Cold solder joint on housing assy.

Repair cold solder joint

Defective capacitor

Replace defective capacitor

(C309, C310, C311)

PROBLEM

CAUSE

CORRECTIVE ACTION

Содержание Micro Tymp 2

Страница 1: ...4341 State Street Road P O Box 220 Skaneateles Falls NY 13153 0220 Copyright 1995 Micro Tymp 2 Tympanometric System 23640 handle 71170 printer charger Includes CE Model Service Manual Part 236409...

Страница 2: ...or 236409 B New Release 5 28225 6 95 R Settembre 236409 C Added CE Updates Cautions 5 35489 6 97 R Settembre NOTE Drawings illustrations in this document are for reference only Consult system or call...

Страница 3: ...o Tymp 2 Tympanometric System 23640 handle 71170 printer charger Includes CE Model Copyright 1995 Welch Allyn Co 4341 State Street Road Welch Allyn P O Box 220 Skaneateles Falls NY 13153 0220 Service...

Страница 4: ...air technician Required specifications and materials are listed at each step where applicable For example Instructions will start off with a TASK TO DO For example B 3 Unplug Flex Circuit statement Th...

Страница 5: ...atient or user or hazardous malfunction has occurred or is sus pected PROCEED NO FURTHER DO NOT disassemble repair adjust or in any way alter the MicroTymp 2 or the printer charger base instead notify...

Страница 6: ...3 Micro Tymp 2 Noise Test Procedure Section 4 Technical Troubleshooting Guide for Micro Tymp 2 Handles Printer Chargers Section 5 Customer Service Questions Answers Section 6 CALVIN Micro Tymp 2 Cali...

Страница 7: ...the battery meets requirements No corrective action is to be taken However it is good practice to put the battery on charge for however long it is in your possession OR SCENARIO 2 a If the unit DOES...

Страница 8: ...AST REFER TO TUBING ROUTING DIAGRAM ON DRAWING 236300 ALIGN BOARD OVER STAND OFFS WITH BATTERY HOLDER NEAR THE BOTTOM OF THE HANDLE SCREW THE BOARD TO THE STRAIN RELIEFS WITH TWO LONG SCREWS AT THE BO...

Страница 9: ...PIN STRAIGHTENING PLIERS OR FINGERS TO RE ATTACH FLEX CIRCUITS RE ATTACH FRONT HOUSING ASSEM BLY LAY FLEX CIRCUITS IN ACCORDING TO DRAWING 236300 C 5 CALIBRATE HANDLE WITH CALVIN REFER TO SECTION 6 FO...

Страница 10: ...________________________ ______________________________________________________________________________ ______________________________________________________________________________ E KEYPAD ASSEMBLY...

Страница 11: ...CK HOUSING REMOVE PROTECTIVE FILM FROM BEZEL RECORD LCD ID ON DOCU MENTATION ALIGN LCD ASSEMBLY WITH FLEX CIRCUIT CONNECTOR ON RIGHT HAND SIDE THEN PLACE INTO HOUSING F 4 SECURE MODULE WITH RETAINER P...

Страница 12: ...EMBLY FOLLOW INSTRUCTIONS IN SECTION F G 6 REMOVE ESD SHIELDS THE LCD GASKET AND THE ESD SHIELD ARE CONNECTED WITH TWO STRIPS OF ESD TAPE THESE ASSEMBLED SHIELDS SHOULD PULL OUT OF THE BOTTOM HOUSING...

Страница 13: ...ACEMENT NOTES ________________________________________________________________________ I BALLAST I 1 REMOVE BALLAST FROM POWER SUPPLY BOARD REMOVE BATTERY COVER AND BATTERY FROM HANDLE GENTLY PULL BAL...

Страница 14: ...ION 12 END PRINTER CHARGER KEYPAD REPLACEMENT NOTES ________________________________________________________________________ ___________________________________________________________________________...

Страница 15: ...s shown in the figure above except the two screws marked with arrows These two screws hold the PCB to the lower housing Remove them if the PCB is to be removed after the top panel is off NOTE USE 3 16...

Страница 16: ...ACE PRINTER K 5 ATTACH REPLACEMENT PRINTER TO PAPER WELL PCB SLIDE REPLACEMENT PRINTER UNDER GEAR COVER AND ALIGN SCREW HOLES IN PRINTER WITH HOLES IN PCB PAPER WELL SECURE PRINTER TO PCB BOARD ASSEMB...

Страница 17: ...arged battery Test 1 Leaks 1 1 Open MT2 and remove battery 1 2 Momentarily apply 7 2 VDC across valve coil to latch valve closed See FIG 1 2 for polarity 1 3 Connect Pressure Box T 5657 pressure tube...

Страница 18: ...cc cavity onto the probe tip 3 2 Take Tympanogram of cavity by depressing and releasing black test button 3 3 Observe for noise Repeat 5 times 3 4 Observe the number of rows above baseline None is ide...

Страница 19: ...tment negative contacts as shown in FIG 4 1 below 4 3 Connect Milliammeter Negative lead to positive side of the battery as per FIG 4 1 below 4 4 Connect Milliammeter Positive lead to the positive spr...

Страница 20: ...e possible cause of failure is shorted capacitor C11 5 5 Leave all connections as they are for the next test Test 6 Active Current Drain 6 1 Depress and hold black center push button to activate MT2 6...

Страница 21: ...registers by moving the cursor to each register and typing in 00 Data will turn yellow Press ENTER after AC AD and AE data is erased 7 7 Unit will Update registers then Tools Menu will be automatical...

Страница 22: ...are touching each other or the front housing If they are this will cause noise in the unit B Check to see if the silastic tubing from the front housing to the ballast is pinched C See if the bottom fl...

Страница 23: ...ace or 2nd pixel up in the LCD displayconstantly DimLCDdisplay Checkpowersupplies 5volts Defective PS PCB DefectiveLCDdisplay Replace Keypadproblem Makesurethattheflexispluggedintothekeypadproperly Ch...

Страница 24: ...on MCU board 33uf Defective valve Replace valve Defective seating of Reseat speaker microphone probe tip component or transducer Defective probe tip Replace probe tip Split or frayed silicone tube s...

Страница 25: ...t Loosen pulley set screw Defective drive belt Replace drive belt Defective battery Replace battery Black Red wire reversed Restore black red wire in back of Tymp handle in back of Tymp handle Shorted...

Страница 26: ...int Head Shorted Replace Print Head Poor cable connection P302 Reseat cable Defective U201 Replace U201 Defective Print Head Replace Print Head Defective U201 portions of Replace U201 print missing Po...

Страница 27: ...D TO TAKE THE PLACE OF CALIBRATION SERVICE HANDLE CODE READS LOW BATT THE BATTERY MAY BE DISCHARGED FROM EXTENDED STORAGE 60 DAYS AND SIMPLY NEEDS RECHARGING IF THE BATTERY DOES NOT RECHARGE OVERNIGHT...

Страница 28: ...A REINSERT HANDLE NO DATA NOTHING IN MEMORY COMPUTER INTERFACE SWITCH 4 IS SET ON BOTTOM OF PRINTER FOR POSSIBLE CAUSES AND SOLUTIONS FOR THESE MESSAGES REFER TO PRINTER FUNCTION MESSAGES TABLE 2 ON P...

Страница 29: ...nc Skaneateles Falls NY 13153 All rights reserved This document is the property of Welch Allyn Inc The contents are considered confi dential and proprietary This document can only be duplicated or dis...

Страница 30: ...cess 31 2 1 Background Information 31 2 2 Error Handling 31 2 3 Calvin res File 32 2 4 Log File 32 2 5 Potentiometer Setting Routine 32 3 Operational Procedure 33 4 Menu Options 9 5 Calibration Signat...

Страница 31: ...alibrate microphone gain pot o calibrate admittance offset pot o calibration pressure offset pot o calibration pressure gain pot o motor speed table calibration Additional functional testing is inters...

Страница 32: ...erial number the final pot setting with result values and total test time per unit This log should be very helpful for troubleshooting 2 5 Potentiometer Setting Routine Several potentiometers pots are...

Страница 33: ...ish communications with the handle This step will verify that the handle is properly seated in the base and that the handle is alive Note that a communications failure can occur at any point during ca...

Страница 34: ...perator is instructed to place the pressure tube on the end of the handle tip Pres sure is set to a positive pressure and the pressure is read After a time delay the pres sure is reread and the result...

Страница 35: ...Tone generated but not at 85 dB Bad speaker gain or admittance gain pots MicGain Pot cannot be adjusted Bad microphone gain pot Harmonic Distortion Check This calibration step will measure the amount...

Страница 36: ...value of the admittance gain pot is read to determine if it matches the value it should be for the cavity set on the tip Errors Corrections Volume is incorrect Redo sound cal Calibrate Motor Speed Th...

Страница 37: ...day calibration of the B K 2231 sound meter A 124 dB piston phone is needed to do this adjustment Tools Menu I2E2PROM Editor Invokes an editor which allows the I2E2PROM contents of the handle to be in...

Страница 38: ...orking correctly HandlePressureMenu Pressure Up Sends a pressure up command to the handle Pressure Down Sends a pressure down command to the handle and sums the pres sure sweep rate table and displays...

Страница 39: ...on is marked in white Locations which have been changed are displayed with yellow Prom File Menu This menu allows you to load default values in to PROM from a file or to save PROM values to a file All...

Страница 40: ...register at AC hex is a Slave processor history register If a fatal error occurs with the Slave a bit is set in this register AD hex is the Master status register if there is a problem with the Maste...

Страница 41: ...eroing each location C I Read Pressure Returns current pressure reading C J Read Microphone Returns current value at mic A D C K Start Tymp Runs a Tymp C L Set LCD Pattern Displays a pattern to the LC...

Страница 42: ...00011 88 58 01011000 173 ad 10101101 4 04 00000100 89 59 01011001 174 ae 10101110 5 05 00000101 90 5a 01011010 175 af 10101111 6 06 00000110 91 5b 01011011 176 b0 10110000 7 07 00000111 92 5c 01011100...

Страница 43: ...3a 00111010 143 8f 10001111 228 e4 11100100 59 3b 00111011 144 90 10010000 229 e5 11100101 60 3c 00111100 145 91 10010001 230 e6 11100110 61 3d 00111101 146 92 10010010 231 e7 11100111 62 3e 00111110...

Страница 44: ...or both of the error registers For example assume the Historical Master Error Register contains a 0a The binary equivalent is 00001010 Notice now that there are two digits that are set to one Matchin...

Страница 45: ...or 40 X1XXXXXX 3 2 1 Description ThiserrorresultsfromtheRAMmemoryinsidetheSlavemicrocontrollertestingbad ThismemoryisusedtotemporarilystoreprograminformationwhiletheSlaveisoperating 3 2 2 Suggestions...

Страница 46: ...ck on 3 5 Home Pump Error 08 XXXX1XXX 3 5 1 Description An error has occurred in which the optical sensor has not detected the pump flag in the proper position after a Home Pump command has been attem...

Страница 47: ...me of design An error will only be registered during the auto zeroing of the pressure transducer before a pressure up occurs 4 5 2 Suggestions Test the pressure transducer section of the circuitry on...

Страница 48: ...rly Investigate the error indicated in the Historical Slave Error Register 4 8 RAM Error 01 XXXXXXX1 4 8 1 Description This error results from the RAM memory inside the Master microcontroller testing...

Страница 49: ...ering down and then powering up Verify that both microcontrollers pins all make good electrical contact to the PCB 5 3 I2C Bus Error 00 00000000 5 3 1 Description The I2C bus is a two wire communicati...

Страница 50: ...s SUPPLIES Item W A Part Loctite Black Max adhesive M 30341 Solder rosin core 020 63SN 37PB M 31446 Cotton swabs Desoldering wick Note The Calvin Calibration System is custom built from the items on t...

Страница 51: ...omponents Calvin Component 20 Edmund Scientific Co Holder Base Plate A365 Mounting of components Calvin Component 21 Edmund Scientific Co Tilt Platform A36 607 Mounting of components Calvin Component...

Страница 52: ...yn service part numbers and material numbers appearing in this manual are for the purpose of familiarizing new technicians with the Welch Allyn parts numbering system Order replacement parts as always...

Страница 53: ...P 1 23641 REPAIR 106104 16 DRIVE BELT 1 23641 REPAIR 236330 506 MCU BOARD 1 23641 REPAIR 230035 2 SPEAKER 1 23641 REPAIR 236045 MICROPHONE 1 23641 REPAIR 236303 502 LCD DISPLAY 1 23641 REPAIR 236171 5...

Страница 54: ...ST BLOW SMD 250V TR 2 71171 REPAIR 761013 501 PRINTER COVER CUTTER ASSY 1 71171 REPAIR 761050 1 SPINDLE PAPER ROLL 1 71171 REPAIR 761076 0 POWER CORD DETACH DOM JAP 1 71171 REPAIR 761117 THERMAL PAPER...

Страница 55: ...MT2 DRAWINGS NOS 236300 236302 236304 236305 236308 236330 236340 711700 MICRO TYMP 2 HARDWARE BLOCK DIAGRAM...

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Страница 65: ...SECTION 11 A 02727 PROCESS SHEET EXCERPTS FOR 23641 MICROTYMP 2 HANDLE TESTS...

Страница 66: ...SECTION 12 A 02728 Process Sheet excerpts for 71171 71172 71174 71176 71179 Micro Tymp 2 Printer Charger tests...

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